Tascal Regedit:
http://www2r.biglobe.ne.jp/~tascal/d...etpc/tre_e.htm
There's also PHM Regedit, which has a search function, but unfortunately the website seems to be down at the moment:
http://www.phm.lu/
You might have better luck then I did though.
In any case, either will do the job and both are freeware. Both will present a tree-view of the registry. For your purpose, you need to open up:
HKLM\Software\Microsoft\PimApps\PimExtensions\Contacts\AddIns\
HKLM is the standard short form for HKey Local Machine. You may run across other registry hacks on the web that reference to HKCR or HKCU - now you know where they come from.
In any case to get where you want to go, just follow the folder structure - open HKLM, then Software, then Microsoft etc etc. To delete, tap and hold on the Skype Dialer "folder" and select delete.
When dealing with the registry, make sure you make a backup first. Both apps have the options for this. Good Luck!